R.K.
Since money is an issue:
1) you can get muffin mixes for under $1 -- add water and bake simple, pick up a nice basket at a dollar store and take a basket of muffins to each of them.
2) wash their cars -- clean them inside and out
3) babysit their kids (one family at a time) so Mom can get out and do something for herself
4) invite them for a pasta dinner
5) help them plant a garden--you could get some plants flower or veggie and get a garden going for them or plant one in your yard and give them some of the overflow veggies--or start seeds in March by May you will have nice plants to put outdoors.